“An exciting error interrupts their perfectly structured life.”
Chu Sang U, a strict computer science student, clashes with design major Jang Jae Yeong after removing his name from a project, leading to unexpected sparks.
SangWoo removes his teammates' names from a group presentation for being freeloaders. JaeYoung, who then fails the subject, vows revenge.
SangWoo tries to regain control. JaeYoung prevents a fight between SangWoo and a potential mentor in a bar.
SangWoo allows JaeYoung to visit for ten minutes. JaeYoung decides to change his approach. They perform their French presentation together.
JaeYoung invites SangWoo to the movies, causing him confusion. JaeYoung vows to leave SangWoo alone, taking a part-time job to keep busy. JiHye helps SangWoo debug an error.
SangWoo attempts to apologise, but JaeYoung is unmoved. SangWoo tries again, and JaeYoung agrees to work on the project together. Their respective working styles cause problems.
SangWoo and JaeYoung play Yaja Time. JaeYoung and JiHye discuss SangWoo, and YuNa tells SangWoo about JaeYoung's past relationships. JaeYoung gives SangWoo a demo of the proposed two-week trial. JaeYoung is accepted into Dex.
SangWoo refuses the two-week trial. YuNa accuses JaeYoung of being boring. JiHye confesses to SangWoo. SangWoo confesses to JaeYoung.
Park Seo-ham
Jang Jae-young
Park Jae-chan
Choo Sang-woo
Song Ji-oh
Choi Yoo-na
Kim No-jin
Ryu Ji-hye
Kim Won-gi
Go Hyung-tak
Choi Su-geon
Han Soo-young
Cha Jae-hoon
Lee Dong-geon
Jung Joon-gyo
Ted Hyung
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